string/test-strlen.c

   1 /* Test and measure strlen functions.
   2    Copyright (C) 1999, 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Jakub Jelinek <jakub@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #define TEST_MAIN
  22 #include "test-string.h"
  23
  24 typedef size_t (*proto_t) (const char *);
  25 size_t simple_strlen (const char *);
  26 size_t builtin_strlen (const char *);
  27
  28 IMPL (simple_strlen, 0)
  29 IMPL (builtin_strlen, 0)
  30 IMPL (strlen, 1)
  31
  32 size_t
  33 simple_strlen (const char *s)
  34 {
  35   const char *p;
  36
  37   for (p = s; *p; ++p);
  38   return p - s;
  39 }
  40
  41 size_t
  42 builtin_strlen (const char *p)
  43 {
  44   return __builtin_strlen (p);
  45 }
  46
  47 static void
  48 do_one_test (impl_t *impl, const char *s, size_t exp_len)
  49 {
  50   size_t len = CALL (impl, s);
  51   if (len != exp_len)
  52     {
  53       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  54              len, exp_len);
  55       ret = 1;
  56       return;
  57     }
  58
  59   if (HP_TIMING_AVAIL)
  60     {
  61       hp_timing_t start, stop, best_time = ~ (hp_timing_t) 0;
  62       size_t i;
  63
  64       for (i = 0; i < 32; ++i)
  65         {
  66           HP_TIMING_NOW (start);
  67           CALL (impl, s);
  68           HP_TIMING_NOW (stop);
  69           HP_TIMING_BEST (best_time, start, stop);
  70         }
  71
  72       printf ("\t%zd", (size_t) best_time);
  73     }
  74 }
  75
  76 static void
  77 do_test (size_t align, size_t len, int max_char)
  78 {
  79   size_t i;
  80
  81   align &= 7;
  82   if (align + len >= page_size)
  83     return;
  84
  85   for (i = 0; i < len; ++i)
  86     buf1[align + i] = 1 + 7 * i % max_char;
  87   buf1[align + len] = 0;
  88
  89   if (HP_TIMING_AVAIL)
  90     printf ("Length %4zd, alignment %2zd:", len, align);
  91
  92   FOR_EACH_IMPL (impl, 0)
  93     do_one_test (impl, buf1 + align, len);
  94
  95   if (HP_TIMING_AVAIL)
  96     putchar ('\n');
  97 }
  98
  99 static void
 100 do_random_tests (void)
 101 {
 102   size_t i, j, n, align, len;
 103   unsigned char *p = buf1 + page_size - 512;
 104
 105   for (n = 0; n < ITERATIONS; n++)
 106     {
 107       align = random () & 15;
 108       len = random () & 511;
 109       if (len + align > 510)
 110         len = 511 - align - (random () & 7);
 111       j = len + align + 64;
 112       if (j > 512)
 113         j = 512;
 114
 115       for (i = 0; i < j; i++)
 116         {
 117           if (i == len + align)
 118             p[i] = 0;
 119           else
 120             {
 121               p[i] = random () & 255;
 122               if (i >= align && i < len + align && !p[i])
 123                 p[i] = (random () & 127) + 1;
 124             }
 125         }
 126
 127       FOR_EACH_IMPL (impl, 1)
 128         if (CALL (impl, p + align) != len)
 129           {
 130             error (0, 0, "Iteration %zd - wrong result in function %s (%zd) %zd != %zd, p %p",
 131                    n, impl->name, align, CALL (impl, p + align), len, p);
 132             ret = 1;
 133           }
 134     }
 135 }
 136
 137 int
 138 test_main (void)
 139 {
 140   size_t i;
 141
 142   test_init ();
 143
 144   printf ("%20s", "");
 145   FOR_EACH_IMPL (impl, 0)
 146     printf ("\t%s", impl->name);
 147   putchar ('\n');
 148
 149   for (i = 1; i < 8; ++i)
 150     do_test (0, i, 127);
 151
 152   for (i = 1; i < 8; ++i)
 153     do_test (i, i, 127);
 154
 155   for (i = 2; i <= 10; ++i)
 156     {
 157       do_test (0, 1 << i, 127);
 158       do_test (1, 1 << i, 127);
 159     }
 160
 161   for (i = 1; i < 8; ++i)
 162     do_test (0, i, 255);
 163
 164   for (i = 1; i < 8; ++i)
 165     do_test (i, i, 255);
 166
 167   for (i = 2; i <= 10; ++i)
 168     {
 169       do_test (0, 1 << i, 255);
 170       do_test (1, 1 << i, 255);
 171     }
 172
 173   do_random_tests ();
 174   return ret;
 175 }
 176
 177 #include "../test-skeleton.c"